I have an 89 gmc c1500 with a 5.0 litre 5speed trans and the other night when i got home i shut it off and a few mins later was goin to leave again and it would not go into reverse. i have a new clutch and slave cylinder. it has been doin fine but when you shift towards reverse it slips into 4th and now fifth is out to. when you put it into 1st through 4th it moves side to side like neutral

It sounds like the shift linkage is badly worn where the gear lever is supported on the shaft. Somtimes there is a plastic bush which ends up wearing out and disintegrating causing the slop you have described. You will need to remove the gear lever assembly from the vehicle to work on it. You should be able to get a replacement bush to repair it.

i had been told it was the synchronizers but i was not sure. do i have to pull the trans to do what your saying. and would you know about what a rough estimate of parts isi had been told it was the synchronizers but i was not sure. do i have to pull the trans to do what your saying. and would you know about what a rough estimate of parts is

I’m not familiar with the vehicle so I will do the best I can. The gear selector setup can be one of two types. Looking at transmission from underneath vehicle, you should be able to work out the type.Type 1: The gearstick assembly is actually part of the transmission and connected directly to the shift selectors which are all internal to the transmission. With this type, it will mean removing the transmission from the vehicle and dismantling it to repair the failed parts. Access to verify the setup is usually done by removing the central console and any sealing boots around the gear lever.Type 2: The gear selector assembly is bolted on top of the transmission with external rods and actuating arms operating the internal shift mechanism. With this type, the assembly can be removed with the transmission still in the vehicle and then repaired before reattaching. Access is as for Type 1. Disconnect the selector rods from the actuating arms on the side of the transmission and then undo the bolts securing the gear shift assembly. Once out, it should be able to be dismantled to ascertain the worn parts. Replacement parts may not be available. If so you will have to get the whole assembly. An auto salvage yard would be a place to start.If you are confident in doing the work yourself, the cost of individual bushes and other parts, if available, for type 2 could be under $50. A whole assembly should be under $300.I’m not familiar with the vehicle so I will do the best I can. The gear selector setup can be one of two types. Looking at transmission from underneath vehicle, you should be able to work out the type.
Type 1: The gearstick assembly is actually part of the transmission and connected directly to the shift selectors which are all internal to the transmission. With this type, it will mean removing the transmission from the vehicle and dismantling it to repair the failed parts. Access to verify the setup is usually done by removing the central console and any sealing boots around the gear lever.
Type 2: The gear selector assembly is bolted on top of the transmission with external rods and actuating arms operating the internal shift mechanism. With this type, the assembly can be removed with the transmission still in the vehicle and then repaired before reattaching. Access is as for Type 1. Disconnect the selector rods from the actuating arms on the side of the transmission and then undo the bolts securing the gear shift assembly. Once out, it should be able to be dismantled to ascertain the worn parts. Replacement parts may not be available. If so you will have to get the whole assembly. An auto salvage yard would be a place to start.
If you are confident in doing the work yourself, the cost of individual bushes and other parts, if available, for type 2 could be under $50. A whole assembly should be under $300.

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The computer has lost its memory for idle control possibly.Try this, crank the truck and shut is off.Do this as many as 20 times , each time try to leave it running for 2 or 3 seconds so you can see if it will idle on its own.Do this till it relearns base idle.

I have a 94 with the same problem. It turns out that it is the park safety switch located on the back drivers side of the engine hooked to the top of the trans. It is such a possition that it catches all the weather and the connections corrode. It is a treat to get your hand on it but it can be done if you can wiggle it side to side chances are it will start. The permant fix would be to unplug clean throughly and lubricate.